Words ending
in -ness.

aware → awareness

Knowing about something.

“The poster raises awareness of litter.”

bright → brightness

How bright something is.

“Turn down the brightness of the screen.”

busy → business

Buying and selling goods, or a company.

“Her business sells handmade cards.”

clever → cleverness

Being quick to learn and understand.

“Her cleverness helped solve the puzzle.”

dark → darkness

Having little or no light.

“The room was in darkness.”

empty → emptiness

Being empty.

“The emptiness of the hall made it echo.”

fair → fairness

Treating people equally.

“The referee was known for her fairness.”

fit → fitness

Being healthy and strong.

“We do fitness exercises every morning.”

forgive → forgiveness

Stopping being angry with someone.

“He asked for forgiveness after the argument.”

good → goodness

Being good or kind.

“She helped out of the goodness of her heart.”

happy → happiness

The feeling of being happy.

“Her face was full of happiness.”

ill → illness

Being unwell.

“He missed a week of school through illness.”

kind → kindness

Being kind and caring.

“Thank you for your kindness.”

lazy → laziness

Not wanting to work or try.

“Laziness meant his homework was late.”

lonely → loneliness

Feeling alone and sad.

“Loneliness can be hard for older people.”

sad → sadness

The feeling of being sad.

“There was sadness when the holiday ended.”

sick → sickness

Being ill.

“Sea sickness spoiled the boat trip.”

soft → softness

Being soft to touch.

“I love the softness of the kitten's fur.”

thick → thickness

How thick something is.

“Measure the thickness of the book.”

tired → tiredness

The feeling of needing rest.

“Tiredness made it hard to concentrate.”

useful → usefulness

Being useful.

“The usefulness of the tool surprised us.”

weak → weakness

Not being strong, or a fault.

“Spelling is my weakness, but I am improving.”